PPT: How Things Work | EVS for Class 4 (Our Wondrous World: New NCERT) PDF Download

 Page 1


How Things 
Work
Page 2


How Things 
Work
Introduction
Explores the mechanics of everyday 
objects
Pencils, coins, toys and other common items
Focuses on:
How objects spin
Why some objects float while others sink
Investigate
Investigate how things like spinning coins and floating 
paper boats operate.
Page 3


How Things 
Work
Introduction
Explores the mechanics of everyday 
objects
Pencils, coins, toys and other common items
Focuses on:
How objects spin
Why some objects float while others sink
Investigate
Investigate how things like spinning coins and floating 
paper boats operate.
Spinning Objects
Spinning
Spinning means something turning in circles, like a 
coin or a top.
Key observations:
Coins and bangles spin well; erasers do not
Spinning coins slow down, shake, and stop due to 
loss of balance
Square spinners appear circular when spun 
quickly due to blurred edges
Page 4


How Things 
Work
Introduction
Explores the mechanics of everyday 
objects
Pencils, coins, toys and other common items
Focuses on:
How objects spin
Why some objects float while others sink
Investigate
Investigate how things like spinning coins and floating 
paper boats operate.
Spinning Objects
Spinning
Spinning means something turning in circles, like a 
coin or a top.
Key observations:
Coins and bangles spin well; erasers do not
Spinning coins slow down, shake, and stop due to 
loss of balance
Square spinners appear circular when spun 
quickly due to blurred edges
Did you know?
Spinning Top
 Spinning tops have been used in India for thousands 
of years, originally made of clay. Lattu is a popular 
Indian top, commonly crafted from wood.
Charkha
A charkha (spinning wheel) twists cotton fibre into 
thread. It has a large wheel that spins when turned by 
hand. Mahatma Gandhi used the charkha to make 
handmade clothes.
Page 5


How Things 
Work
Introduction
Explores the mechanics of everyday 
objects
Pencils, coins, toys and other common items
Focuses on:
How objects spin
Why some objects float while others sink
Investigate
Investigate how things like spinning coins and floating 
paper boats operate.
Spinning Objects
Spinning
Spinning means something turning in circles, like a 
coin or a top.
Key observations:
Coins and bangles spin well; erasers do not
Spinning coins slow down, shake, and stop due to 
loss of balance
Square spinners appear circular when spun 
quickly due to blurred edges
Did you know?
Spinning Top
 Spinning tops have been used in India for thousands 
of years, originally made of clay. Lattu is a popular 
Indian top, commonly crafted from wood.
Charkha
A charkha (spinning wheel) twists cotton fibre into 
thread. It has a large wheel that spins when turned by 
hand. Mahatma Gandhi used the charkha to make 
handmade clothes.
Examples of spinning 
objects:
Ceiling fans
Rotate to circulate air in rooms
Potter's wheels
Spin to help shape clay into pottery
Wheels
Wheels used in vehicles helps in covering distances easily